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Subject: in cr2, why delta files have "e" in them?

elenorcoli opened this issue on Nov 04, 2006 · 6 posts
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elenorcoli ( ) posted Sat, 04 November 2006 at 5:59 PM · edited Wed, 18 September 2024 at 10:38 PM

valueOpDeltaAdd
    Figure 1
    BODY:1
    SuperHero
   deltaAddDelta 1.000000
   indexes 403
   numbDeltas 807
   deltas
    {
    d 1 -3.49991e-005 0 -2.00048e-006     <----see what is that about?
    d 2 -0.000257999 0 0
    d 3 -0.000151999 0 -0.000120997
    d 4 -0.000927001 0 -0.000723001
    d 5 -0.000351999 0 -0.000470001
    d

 

that's a tiny chunk from p4 nude man.  why is it throwing an e in with these numbers?

gracias

akanwa ( ) posted Sat, 04 November 2006 at 6:07 PM

It looks like scientific notation. Saves space over writing the two numbers as -0.0000349991 and -0.00000200048 respectively. Just saves having to write out a lot of zeros for very large or very small numbers.

elenorcoli ( ) posted Sat, 04 November 2006 at 7:51 PM

ahh yes excellent observation

kuroyume0161 ( ) posted Sat, 04 November 2006 at 8:52 PM

Exactly.  That is scientific notation.  It is an acceptable format used by, for instance, C/C++/Java for text-based notation of floating point numbers.  The 'e' stands for 'exponential notation', as in:

-2.000048x10^-006

'e' replaces the (x10^) notation.

C makes it easy to shoot yourself in the foot. C++ makes it harder, but when you do, you blow your whole leg off.

 -- Bjarne Stroustrup

Contact Me | Kuroyume's DevelopmentZone

bagginsbill ( ) posted Mon, 06 November 2006 at 8:34 AM

Nobody notes the irony that -0.0000349991  and -3.49991e-005 are exactly the same number of characters? Chuckle. I'm a programmer so this is funny to me. Sorry.

Renderosity forum reply notifications are wonky. If I read a follow-up in a thread, but I don't myself reply, then notifications no longer happen AT ALL on that thread. So if I seem to be ignoring a question, that's why. (Updated September 23, 2019)

kuroyume0161 ( ) posted Mon, 06 November 2006 at 1:21 PM

So much for saving space, huh? ;)

C makes it easy to shoot yourself in the foot. C++ makes it harder, but when you do, you blow your whole leg off.

 -- Bjarne Stroustrup

Contact Me | Kuroyume's DevelopmentZone

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